Ashton Kutcher's Steve Jobs biopic jOBS has had its premiere at the Sundance Film Festival.

The movie received a lukewarm response from critics, but the Two and a Half Men star was roundly praised for "nailing" the late Apple co-founder's mannerisms and "disappearing into the role".

Read on to find out what the early reviews are saying about Kutcher's performance:

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The Hollywood Reporter (Justin Lowe)
"Kutcher has an advantage in the role with his passing resemblance to Jobs, but he also faithfully re-creates some of his character's physical mannerisms for additional dimensionality. He manages a fair imitation of Jobs's speaking style as well, particularly when delivering a number of monologues, usually while haranguing his employees or board of directors."

Indiewire (Eric Kohn)
"Stylishly realized despite its unsophisticated storyline, jOBS has been shot by Russell Carpenter with brightly lit images that accentuate the eponymous innovator's constant motivation. That achievement is complemented by Kutcher's committed performance, certainly his most impressive turn in years, which conveys the character's focused, manipulative intentions in each calculated look. But Matt Whiteley's by-the-numbers screenplay, which tracks Jobs from his slacker days as a college dropout to the launching of Apple computers in his parents' garage and eventual transformation into billionaire CEO, can't keep pace."

CNET (Casey Newton)
"Kutcher drew scepticism when he was announced as the film's lead, despite an uncanny resemblance to the man he would be playing. But he throws himself into the role, inhabiting Jobs in his mannerisms and gestures while doing a more than creditable impression of the man's voice. Kutcher also captures Jobs's deliberate, slightly hunched-over walk. At moments, as during an enjoyable sequence in which Jobs recruits members for the Macintosh team, Kutcher disappears into the role."

Vulture (Jada Yuan and Katie Van Syckle)
"Kutcher isn't 'totally wrong' for Jobs, as [Steve] Wozniak has asserted. He certainly looks more the part than expected. The movie opens on the Apple town hall staff meeting in 2001 where a white-haired, spectacled, black-turtleneck-wearing Jobs announced the iPod and got a standing ovation. (It seems that every time the man talks in this movie, he gets a standing ovation.) Kutcher looks like Kutcher aged by make-up, but at least the actor bears an uncanny resemblance to Jobs - which the press notes tell us again and again...Whether Kutcher achieves morphing into Jobs is highly debatable (Kutcher's Jobs has an improbably Midwestern accent for a guy born in San Francisco), but it's certainly not for lack of trying."

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Cinema Blend (Katey Rich)
"As the closing night film of this year's Sundance Film Festival, jOBS takes a spot shared by less-than-auspicious titles like last year's The Words or Joel Schumacher's Twelve. It's much better than both of those movies, but its mediocrity is especially glaring given its constantly innovative subject. Surprisingly enough, Ashton Kutcher isn't to blame for any of it. He works hard not to rest on his basic physical similarities to Jobs, summoning the man's charisma and often harsh devotion to his work, delivering even the most audacious of monologues with the kind of gravitas you imagine Jobs had. Kutcher commits himself admirably to a near impossible part - and it's a shame the rest of the film wasn't willing to work that hard."

The Verge (Ross Miller)
"Ashton Kutcher said he watched "hundreds of hours of footage [and] met with several of Jobs's friends" in preparation for the role, and to his credit, it shows. From that first town hall scene, Kutcher nails the mannerisms of Jobs the Orator. The pacing. The hand gestures. The unique quirks in his speech pattern. It takes a second to adjust to Kutcher's lower-pitched voice, but after that, he captures Jobs's trademark showmanship. And for the most part, he captures the look of Jobs, as well - albeit one that's always in peak physical condition."

Gizmodo (Seth Kinkaid)
"As the film moved forward and we are introduced to other key parts of the cast, most notably Josh Gad playing Steve Wozniak, I began to see Steve Jobs and not Ashton Kutcher. I was immediately aware of the idiosyncrasies that I had seen the real Jobs have in keynotes and that they were suddenly being sucked into Kutcher's performance. Within minutes I had forgotten I was watching an actor. He even got Jobs's lanky, lurching walk down to a science. Kutcher nailed his character, and I realized this as he looked more and more like Jobs, and less like himself."

/Film (Germain Lussier)
"Kutcher gives a solid performance as the main character, losing himself in Jobs's voice and mannerisms. However, at times, those slip away and he once again becomes Ashton Kutcher, usually in the loud moments where Jobs has to scream at someone. This kind of overblown melodrama happens a lot and, again, is an example of the film never really delving under the surface."

jOBS opens in the US on April 19, while a UK release date has yet to be announced.